Filter for liquids



Patented May13, 1930 "UNITED" STATES PATENT Aol-Flce mnnnenormmc, or Brunner, NEAR Corman-AGEN, DENMARK FILTER ron LIeUvIns Application med September 13, 1927, Serial No. 219,334, and in Denmark July 2li,V 192'?.v

I This invention relates to a lilter intended i for cleansing liquids of'mechanical impurities contained therein. In order that the filter -may be capable of cleansin smaller quantities 5 of liquid by clearing the liquid of impurities of minimal size, it has been designed in such a'manner that narrow slits are provided between suitably shaped bodies, through which slits the liquid is forced to ow and the width of which slits is smaller` than the width or size of the smallest impurities contained in the liquid, the said impurities being thereby retained and separated from the li uid when the latter enters and passes throng the slits. -It is very important that the slits formed between the lter bodies only extend a short distance in the direction of How of the liquid,

- as'the friction produced during the passage..

or' flow thenbecomes of minor importance, and hollow spaces or channels must be arranged `contigu`ously to the slits, capable of receivin the impurities iiltered off, as well as of distri uting theV liquid in such a way that the impurities are evenly deposited. Further the filter must be easy tocleanse, and accordingly the filter, which is normally enclosed in a filter housing, must be capable of being removed from the said housin in, an easy manner, at the Sametime carrying the impurities retained by the filter along with it, and finally the individual filter bodies constitutin the filter must be easily separable or detacha le.

plied Vwith by the filter which is the object of the present` invention. kThis 'lter consists of a. number of filter bodies in the shape of plates or discs, which are stacked on top of each other and clamped together, thus -forming the said tilterslits between the sure faces of the plates ordiscs. These filter plates or discs are provided, on one or both sides, with two systems ofchannels,` one of which systems is connected with the` inlet `for the liquid, for instance through one .or more substantially centrally arranged holes in the plates or discs, while the other system is connected with the outlet opening for the liquid, for instance through the space surrounding the circumferences of-theplates or discs.

These systems of channels may be arranged in several `different ways. Each plate may, for instance, be provided onl its two sides with channels belonging to each separate system, or the plates or discs may be provided with channels of one and the other system alternately; channelsbelonging to both systems may also be arranged on the same side of a disc, Vand various other 'combinations may be employed.

The portion 4 of the surface of the discs forming the slits when the discs are stacked on top of each other may be latcone-shaped, .spherically shaped or have any other suitable shape. The channels are made'in these p0r- `tions of the surfaces as a sunk-in impression. If both systems of channels are to be found on one side of a plate, a raised cam or ridge is formed by the impression, becausethe sys- .tems of channels must be separated from 'each other, for instance in the form of'a zig zag line or band separating the two systems. The

bottoms of the channels may be flat, rounded 'or sloping in relation to the raised portion of the disc,or have any othersuitable shape. The channels may be rectilinear, bent or curved in any suitable way, and they may bearranged radially, as chords, tangentsor in i any other way.

Besides complying with all demands as to suitability of form and shape the-invention is of special advantage in that the filter plates or discs are easily and cheaply'produced'and All the above-mentioned demands are com' may be made with the great accuracy necessary or plates 4or, discs serving to form slits i.

The impression in the plate or disc is made by 9 :using a matrice or die for the punch of the press. The impression may be made -by a single pressing operation, but may suitably also be made by a number of pres. ing operations, the one succeeding the other and different dies being used so that the plates or discs appear in their final sha-pe or form after the last pressing. If desired the treatment of the plates may be cncluded by the platesA being machined, or ground on a grinding machine, or by-bein ground by hand employing grinding pow er, or the raised portion of the impress1on may be treated in any other similar way.

When the employed in the filtration of the liquid are formed, either by the raised impression being provided with still further raised portions or areas o r by means of specially arranged portions or ridgesor the like independent of the raised impression, or by means of thin sheets or pieces of metal, paper, fibre or the like inserted between the discs, of a thick-4 ness corresponding to the desired width of the slits.v As already mentioned the impresf' sion on the plates or discs may be confined to one side of thediscs or may exist'on both sides. Preferably the systems of channels may be impressed on one side of the plate or disc, and the impression (ridges, raised areas or the'like) determining the width of the is provided (Fig.

slits on-the other.

The plates or discs are clamped together by means o f one or more throughgoing bolts, or in any other way.

A constructional form of the invention is illustrated in the drawing, in which Fig. ljshows a part sectional longitudinal view of the filter, the sections through the lter discs being alternately on the lines Cf-D and in Fig. 3,

Fig-2 a transverse sectional view on line A--Bli in,Fig. 3 of one of the filter discs, and

3 the filter disc as seen from above.

The upturned surface ofthe filter discs a is provided with a zigzag-shaped, raised cam or ridge b, and a central hole c is provided, permitting the passage of the fluid through the filter which consists of a suitable number of discs or plates a. The discs are clamped Itogether by means of a bolt p extending through the holesc, and are supported in relation to the said bolt p by means of the projections d extending from the circumferences of the holes c. In the surface of the discs the two channel systems'f and dq arranged, separated bythe cam: or ri ge b. f is the inner channel system, unfiltered liquid flows 'after having entered through the hole-c, the arrows e indicating the direction of flow of the liquid. The 1mpurities are retained in the inner channel system, 'while the Vfiltered liquid ows over the cam or ridgeb into the outer channel system g, which conveys the liquid to the filter housing h. The bottom side of the 'filter disc 2) with an annular rojection i which projects from theotherwiseflat bottom side k a distance correspondin to the widthl of the slits. Thebottom o the filter discs are stacked the slits to which the channels f rises slightly from the centre of the disc outwards, while the bottom of the channels g sinks in the outward direction in a corresponding manner, byV which it is obtained that'the cross sectional area of the .channels increases or `decreases in a suitable manner in .faccordance with .the quantity of liquid flowing through any cross sectional area. This ensures an even utilization of the whole operative filter area,.a11d correspondingly even distribution of the deposited impurities.

The invention is not bound to the constructional form above describedy and ,set forth which, as already mentioned, should be taken as an example only, and it may be carried out in several different ways without thereby departing from the principles of the invention.

I claim 1. Apparatus of the kind described for straining or filtering liquids',consisting of a plurality of superposed or juxtaposed plates having raised portions which are shaped to form a narrow passage between adjacent plates over the said projecting or raised portions, the said passage being'substantially zig-zag which connects a series of inlet channels with a series of outlet channels for the liquid between the raised portions.

2. In a filtering apparatusof'the character described, the combination of va plurality of slightly spaced superimposed annular plates, each thereof havingy its upper `surface provided with a zig-zag ridge Vextending completely around the plate,.means for clamping the plates together, anda casing in which the plates are suspended.

3. In a filtering apparatus of the character I described, the combination. of a plurality of slightly spaced superimposed annular plates, each thereof having its upper surface ,provided with a zig-zag ridge extending completely around the plate, and a downwardly projecting flange on the under surface adjacent the inner perlphery, means for clampling the plates together, Iand a casing in i of the spaces on the inside of the ridges being inclined downwardly v'toward the inner periphery to form the inletsand the bottom i surfaces of the spaces on the .outside ofthey ridges being inclineddo'wnwardly toward the outer periphery of .the'plate to' form the outlets, means for clamping the'plates together,

and a casing in which the 'plates are suspended.

5. A filtering element comprising an annular plate havin a. zig-za nd extending completely aroun one sur ace ner periphery to the outer periphe ,spacing ange on the opposite surface adJacent the inner periphery, and lprojections on its inner periphery to center t e plate. v

In testimony whereof I aix my signature.

y ALFRED GRoNNING.

mthein-` 

